Not nearly as much as AT&T charges me for lol. Meaning I get some charges that I can't trace to any certain app yet and during times when it should be on wifi. However this past month I only used 130 some odd MB of the 200 I had BUT I am on wifi alot of the time. I upgraded to the 2gb just to be safe as I may stream some MLB games if I"m away from home and want to make sure I don't go over. It's only 10 more bucks a month compared to 15 they charge you if you go over the 200mb and the 15 is only for an additional 200mb.